So I decided to put my Jack Frost 3D model in Mixamo.com to see how rig-friendly my model is, and It's much better than I expected.
If you're interested in buying this model, I'm selling him on CGTrader. https://www.cgtrader.com/3d-models/character/fantasy/jack-frost-e3e4735e-9a23-4889-9fbd-0db2605398a1?utm_medium